DESCRIPTION

The functions EVP_PKEY_print_public(), EVP_PKEY_print_private() and
EVP_PKEY_print_params() print out the public, private or parameter components
of key pkey respectively. The key is sent to BIO out in human readable
form. The parameter indent indicated how far the printout should be indented.

The pctx parameter allows the print output to be finely tuned by using
ASN1 printing options. If pctx is set to NULL then default values will
be used.

NOTES

Currently no public key algorithms include any options in the pctx parameter
parameter.

If the key does not include all the components indicated by the function then
only those contained in the key will be printed. For example passing a public
key to EVP_PKEY_print_private() will only print the public components.

RETURN VALUES

These functions all return 1 for success and 0 or a negative value for failure.
In particular a return value of -2 indicates the operation is not supported by
the public key algorithm.